Question 891411
Put both into standard form.
4x-y=36, 9y=4x-68


------------------
4x-y=36
-4x-9y=-68
------------------


Add corresponding members to eliminate x.
{{{8y=36+(-68)}}}
{{{8y=-32}}}
{{{highlight(y=-4)}}}


Multiply the first equation by 9 and multiply the second equation by -1.
-----------------
36x-9y=36*9
4x+9y=68
----------------


Add corresponding members to eliminate y.
{{{40x=36*9+68=360-36+68}}}
{{{40x=360+32}}}
{{{40x=392}}}
{{{highlight(x=9.8)}}}